Eye And Orbit

Question 0

Junction of superior and inferior palpebrae, corners of eye

Answer 0

Canthus

Question 1

Meaty area medial to eye?

Answer 1

Lacrimal caruncle

Question 2

Length of optic nerve

Answer 2

1 mm intraocularly

Question 3

Outermost layer of eye

Answer 3

Sclera

Question 4

Anterior, avascular part of sclera

Answer 4

Cornea

Question 5

Middle vascular layer of eye

Answer 5

Uvea

Question 6

Blood vessels of the eye are located here

Answer 6

Choroid

Question 7

Produces aqueous humor

Answer 7

Ciliary body

Question 8

Controls size of pupil

Answer 8

Iris

Question 9

Innermost layer of eye

Answer 9

Retina proper

Question 10

Located between lens and front of retina and contains gel like substance

Answer 10

Vitreous cavity

Question 11

Aqueous humor from ciliary body goes in this chamber

Answer 11

Posterior chamber

Question 12

What separates the two orbits?

Answer 12

Ethmoidal cells and nasal cavity

Question 13

Distance between medial sides of each eye

Answer 13

2.5 cm

Question 14

Angle between both lateral walls

Answer 14

90

Question 15

Angle between the orbits

Answer 15

45

Question 16

Volume of orbit

Answer 16

30 cm3

Question 17

Volume of globe

Answer 17

7 cm3

Question 18

Length of lateral wall of orbit

Answer 18

4-4.5 cm

Question 19

Length of medial wall of orbit

Answer 19

4-4.5 cm

Question 20

Dimensions of base of triangle of orbit

Answer 20

4 cm width, 3.5 cm height

Question 21

Which part of the globe is more exposed? Lateral or medial

Answer 21

Lateral

Question 22

Lies lateral to the optic nerve and gives the greatest and most acute vision of eye

Answer 22

Macula

Question 23

Superior margin of orbit

Answer 23

Frontal bone

Question 24

Lateral margin of orbit

Answer 24

Zygomatic bone and zygomatic process of frontal bone

Question 25

Inferior margin of orbit

Answer 25

Zygomatic bone and maxillary bone

Question 26

Medial margin of orbit

Answer 26

Frontal bone and maxillary bone

Question 27

Bones in the lateral wall of the orbit

Answer 27

Zygomatic bone and greater wing of sphenoid

Question 28

Bones of medial wall of orbit

Answer 28

Lesser wing of sphenoid, lateral wall of ethmoid sinus (lamina papyracea), lacrimal bone

Question 29

Bones of the roof of orbit

Answer 29

Frontal bone, lesser wing of sphenoid

Question 30

Bones of the floor of the orbit

Answer 30

Maxillary bone and palatine bone

Question 31

Bone area drilled in order to access the back of the eye

Answer 31

Temporalis fossa

Question 32

Strongest wall of orbit

Answer 32

Lateral wall

Question 33

Thinnest wall of orbit

Answer 33

Medial wall

Question 34

Anatomic position of the fossa of lacrimal gland

Answer 34

Anterosuperolateral

Question 35

Region of orbit with no bony floor

Answer 35

Posterior 1/3

Question 36

Shape of the anterior 2/3 of orbit

Answer 36

Quadrilateral pyramid

Question 37

Shape of orbit in posterior 1/3

Answer 37

Triangular pyramid

Question 38

Floor of this structure is the roof of the orbit?

Answer 38

Anterior cranial fossa

Question 39

Roof of this structure is floor of the orbit

Answer 39

Maxillary sinus

Question 40

What are the 4 fasciae of the orbit?

Answer 40

Fascia bulba, periorbital, palpebral, muscular

Question 41

Also known as the Tenon's capsule

Answer 41

Fascia bulba

Question 42

Origin of all recti muscles and superior oblique

Answer 42

Annulus of zinn

Question 43

Muscle not originating from the annulus of zinn

Answer 43

Inferior oblique

Question 44

Four parts of optic nerve and corresponding lengths

Answer 44

Intraocular 1mm Intraorbital 30mm Intracanalicular 5-6mm Intracranial 10mm

Question 45

Sensory innervation of eye

Answer 45

Long ciliary nerve (Cn5)

Question 46

Cranial nerve which splits into 2 branches as it exits the superior orbital fissure

Answer 46

Oculomotor

Question 47

Cranial nerve found in the medial part of superior orbital fissure

Answer 47

Abducens

Question 48

Cranial nerve which hugs the orbital roof

Answer 48

Trochlear

Question 49

Muscles which insert in front of the equator of eye

Answer 49

Recti muscles

Question 50

Muscles which insert to the posterior of equator of eye

Answer 50

Oblique muscles

Question 51

Extraocular muscle with no tendon

Answer 51

Inferior oblique

Question 52

Measurements of this structure are important in correction of eye deviations

Answer 52

Spiral of tillaux and insertions of recti muscles

Question 53

Action and innervation of the superior oblique?

Answer 53

Medial rotation, depression, abduction. Cn4

Question 54

Action and innervation of inferior oblique

Answer 54

Lateral rotation, elevation, abduction. Inferior part of cn3

Question 55

Action and innervation of inferior rectus

Answer 55

Depression, lateral rotation, adduction. Inferior part of cn3

Question 56

Action and innervation of superior rectus

Answer 56

Elevation, medial rotation, adduction. Superior part of cn3

Question 57

Action and innervation of lateral rectus

Answer 57

Abduction, cn6

Question 58

Action and innervation of medial rectus

Answer 58

Adduction. Inferior cn3

Question 59

Main blood supply of the eye and orbit

Answer 59

Ophthalmic artery

Question 60

Arterial supply of innermost retina

Answer 60

Central retinal artery

Question 61

Arterial supply of ciliary body and iris

Answer 61

Long posterior ciliary artery

Question 62

Arterial supply of choroid, rods and cones

Answer 62

Short posterior ciliary artery

Question 63

Two emergencies in ophthalmology

Answer 63

Trauma by acid or alcohol, central retinal artery occlusion

Question 64

Functions for production of tears

Answer 64

Lacrimal gland

Question 65

Functions for egress of tears

Answer 65

Lacrimal sac

Question 66

Drainage of the lacrimal sac

Answer 66

Inferior turbinate through nasolacrimal duct

Question 67

Suction effect of lacrimal sac occurs during _______

Answer 67

Blinking

Question 68

Absorbs secretions of lacrimal gland

Answer 68

Lacrimal puncta